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Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost        
Due after five years through ten years   $ 140,439,000    
Due after ten years   1,679,462,000    
Total   1,819,901,000 $ 955,542,000  
Fair Value        
Due after five years through ten years   135,931,000    
Due after ten years   1,642,133,000    
Fair Value   1,778,064,000 957,183,000  
Amortized Cost        
Due in one year or less   7,263,000    
Due after one year through five years   132,157,000    
Due after five years through ten years   920,768,000    
Due after ten years   4,161,108,000    
Amortized Cost   5,221,296,000 3,268,037,000  
Fair Value        
Due in one year or less   7,296,000    
Due after one year through five years   133,418,000    
Due after five years through ten years   919,669,000    
Due after ten years   4,133,095,000    
Fair Value   5,193,478,000 3,330,672,000  
Information with respect to sales of available-for-sale securities        
Sale proceeds   151,314,000 100,754,000 $ 242,733,000
Gross realized gains   750,000 662,000 6,030,000
Gross realized losses   (648,000) (612,000) (3,319,000)
Net realized gain   102,000 50,000 2,711,000
Information with respect to sales of held-to-maturity        
Proceeds from sales of investment securities held to maturity   $ 0 $ 0 0
VISA Class B Shares        
Information with respect to sales of available-for-sale securities        
Net realized gain $ 5,400,000     $ 2,700,000